85320AIL 데이터 시트보기 (PDF) - Integrated Device Technology

부품명

상세내역

제조사

85320AIL

LVCMOS/LVTTL-TO-DIFFERENTIAL 3.3V, 2.5V LVPECL TRANSLATOR

Integrated Device Technology 

ICS85320I

LVCMOS/LVTTL-TO-DIFFERENTIAL 3.3V, 2.5V LVPECL TRANSLATOR

3. Calculations and Equations.

The purpose of this section is to derive the power dissipated into the load.

LVPECL output driver circuit and termination are shown in Figure 4.

VCC

Q1

V

OUT

RL

50

VCC - 2V

FIGURE 4. LVPECL DRIVER CIRCUIT AND TERMINATION

To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination

voltage of V - 2V.

CC

• For logic high, V = V = V – 1.0V

OUT

OH_MAX

CC_MAX

(V - V ) = 1.0V

CC_MAX

OH_MAX

• For logic low, V = V = V – 1.7V

OUT

OL_MAX

CC_MAX

(V - V ) = 1.7V

CC_MAX

OL_MAX

Pd_H is power dissipation when the output drives high.

Pd_L is the power dissipation when the output drives low.

Pd_H = [(V – (V - 2V))/R ] * (V - V ) = [(2V - (V - V ))/R ] * (V - V ) =

OH_MAX

CC_MAX

L

CC_MAX

OH_MAX

CC_MAX

OH_MAX

L

CC_MAX

OH_MAX

[(2V - 1V)/50Ω] * 1V = 20.0mW

Pd_L = [(V – (V - 2V))/R ] * (V - V ) = [(2V - (V - V ))/R ] * (V - V ) =

OL_MAX

CC_MAX

L

CC_MAX

OL_MAX

CC_MAX

OL_MAX

L

CC_MAX

OL_MAX

[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW

IDT™ / ICS™ 3.3V, 2.5V LVPECL TRANSLATOR

11

ICS8532AMI REV A NOVEMBER 13, 2006

Share Link: